1 2 /* pngset.c - storage of image information into info struct 3 * 4 * Last changed in libpng 1.2.17 May 15, 2007 5 * For conditions of distribution and use, see copyright notice in png.h 6 * Copyright (c) 1998-2007 Glenn Randers-Pehrson 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 9 * 10 * The functions here are used during reads to store data from the file 11 * into the info struct, and during writes to store application data 12 * into the info struct for writing into the file. This abstracts the 13 * info struct and allows us to change the structure in the future. 14 */ 15 16 #define PNG_INTERNAL 17 #include "png.h" 18 19 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) 20 21 #if defined(PNG_bKGD_SUPPORTED) 22 void PNGAPI 23 png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background) 24 { 25 png_debug1(1, "in %s storage function\n", "bKGD"); 26 if (png_ptr == NULL || info_ptr == NULL) 27 return; 28 29 png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16)); 30 info_ptr->valid |= PNG_INFO_bKGD; 31 } 32 #endif 33 34 #if defined(PNG_cHRM_SUPPORTED) 35 #ifdef PNG_FLOATING_POINT_SUPPORTED 36 void PNGAPI 37 png_set_cHRM(png_structp png_ptr, png_infop info_ptr, 38 double white_x, double white_y, double red_x, double red_y, 39 double green_x, double green_y, double blue_x, double blue_y) 40 { 41 png_debug1(1, "in %s storage function\n", "cHRM"); 42 if (png_ptr == NULL || info_ptr == NULL) 43 return; 44 45 if (white_x < 0.0 || white_y < 0.0 || 46 red_x < 0.0 || red_y < 0.0 || 47 green_x < 0.0 || green_y < 0.0 || 48 blue_x < 0.0 || blue_y < 0.0) 49 { 50 png_warning(png_ptr, 51 "Ignoring attempt to set negative chromaticity value"); 52 return; 53 } 54 if (white_x > 21474.83 || white_y > 21474.83 || 55 red_x > 21474.83 || red_y > 21474.83 || 56 green_x > 21474.83 || green_y > 21474.83 || 57 blue_x > 21474.83 || blue_y > 21474.83) 58 { 59 png_warning(png_ptr, 60 "Ignoring attempt to set chromaticity value exceeding 21474.83"); 61 return; 62 } 63 64 info_ptr->x_white = (float)white_x; 65 info_ptr->y_white = (float)white_y; 66 info_ptr->x_red = (float)red_x; 67 info_ptr->y_red = (float)red_y; 68 info_ptr->x_green = (float)green_x; 69 info_ptr->y_green = (float)green_y; 70 info_ptr->x_blue = (float)blue_x; 71 info_ptr->y_blue = (float)blue_y; 72 #ifdef PNG_FIXED_POINT_SUPPORTED 73 info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5); 74 info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5); 75 info_ptr->int_x_red = (png_fixed_point)( red_x*100000.+0.5); 76 info_ptr->int_y_red = (png_fixed_point)( red_y*100000.+0.5); 77 info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5); 78 info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5); 79 info_ptr->int_x_blue = (png_fixed_point)( blue_x*100000.+0.5); 80 info_ptr->int_y_blue = (png_fixed_point)( blue_y*100000.+0.5); 81 #endif 82 info_ptr->valid |= PNG_INFO_cHRM; 83 } 84 #endif 85 #ifdef PNG_FIXED_POINT_SUPPORTED 86 void PNGAPI 87 png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr, 88 png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, 89 png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, 90 png_fixed_point blue_x, png_fixed_point blue_y) 91 { 92 png_debug1(1, "in %s storage function\n", "cHRM"); 93 if (png_ptr == NULL || info_ptr == NULL) 94 return; 95 96 if (white_x < 0 || white_y < 0 || 97 red_x < 0 || red_y < 0 || 98 green_x < 0 || green_y < 0 || 99 blue_x < 0 || blue_y < 0) 100 { 101 png_warning(png_ptr, 102 "Ignoring attempt to set negative chromaticity value"); 103 return; 104 } 105 #ifdef PNG_FLOATING_POINT_SUPPORTED 106 if (white_x > (double) PNG_UINT_31_MAX || 107 white_y > (double) PNG_UINT_31_MAX || 108 red_x > (double) PNG_UINT_31_MAX || 109 red_y > (double) PNG_UINT_31_MAX || 110 green_x > (double) PNG_UINT_31_MAX || 111 green_y > (double) PNG_UINT_31_MAX || 112 blue_x > (double) PNG_UINT_31_MAX || 113 blue_y > (double) PNG_UINT_31_MAX) 114 #else 115 if (white_x > (png_fixed_point) PNG_UINT_31_MAX/100000L || 116 white_y > (png_fixed_point) PNG_UINT_31_MAX/100000L || 117 red_x > (png_fixed_point) PNG_UINT_31_MAX/100000L || 118 red_y > (png_fixed_point) PNG_UINT_31_MAX/100000L || 119 green_x > (png_fixed_point) PNG_UINT_31_MAX/100000L || 120 green_y > (png_fixed_point) PNG_UINT_31_MAX/100000L || 121 blue_x > (png_fixed_point) PNG_UINT_31_MAX/100000L || 122 blue_y > (png_fixed_point) PNG_UINT_31_MAX/100000L) 123 #endif 124 { 125 png_warning(png_ptr, 126 "Ignoring attempt to set chromaticity value exceeding 21474.83"); 127 return; 128 } 129 info_ptr->int_x_white = white_x; 130 info_ptr->int_y_white = white_y; 131 info_ptr->int_x_red = red_x; 132 info_ptr->int_y_red = red_y; 133 info_ptr->int_x_green = green_x; 134 info_ptr->int_y_green = green_y; 135 info_ptr->int_x_blue = blue_x; 136 info_ptr->int_y_blue = blue_y; 137 #ifdef PNG_FLOATING_POINT_SUPPORTED 138 info_ptr->x_white = (float)(white_x/100000.); 139 info_ptr->y_white = (float)(white_y/100000.); 140 info_ptr->x_red = (float)( red_x/100000.); 141 info_ptr->y_red = (float)( red_y/100000.); 142 info_ptr->x_green = (float)(green_x/100000.); 143 info_ptr->y_green = (float)(green_y/100000.); 144 info_ptr->x_blue = (float)( blue_x/100000.); 145 info_ptr->y_blue = (float)( blue_y/100000.); 146 #endif 147 info_ptr->valid |= PNG_INFO_cHRM; 148 } 149 #endif 150 #endif 151 152 #if defined(PNG_gAMA_SUPPORTED) 153 #ifdef PNG_FLOATING_POINT_SUPPORTED 154 void PNGAPI 155 png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma) 156 { 157 double gamma; 158 png_debug1(1, "in %s storage function\n", "gAMA"); 159 if (png_ptr == NULL || info_ptr == NULL) 160 return; 161 162 /* Check for overflow */ 163 if (file_gamma > 21474.83) 164 { 165 png_warning(png_ptr, "Limiting gamma to 21474.83"); 166 gamma=21474.83; 167 } 168 else 169 gamma=file_gamma; 170 info_ptr->gamma = (float)gamma; 171 #ifdef PNG_FIXED_POINT_SUPPORTED 172 info_ptr->int_gamma = (int)(gamma*100000.+.5); 173 #endif 174 info_ptr->valid |= PNG_INFO_gAMA; 175 if(gamma == 0.0) 176 png_warning(png_ptr, "Setting gamma=0"); 177 } 178 #endif 179 void PNGAPI 180 png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point 181 int_gamma) 182 { 183 png_fixed_point gamma; 184 185 png_debug1(1, "in %s storage function\n", "gAMA"); 186 if (png_ptr == NULL || info_ptr == NULL) 187 return; 188 189 if (int_gamma > (png_fixed_point) PNG_UINT_31_MAX) 190 { 191 png_warning(png_ptr, "Limiting gamma to 21474.83"); 192 gamma=PNG_UINT_31_MAX; 193 } 194 else 195 { 196 if (int_gamma < 0) 197 { 198 png_warning(png_ptr, "Setting negative gamma to zero"); 199 gamma=0; 200 } 201 else 202 gamma=int_gamma; 203 } 204 #ifdef PNG_FLOATING_POINT_SUPPORTED 205 info_ptr->gamma = (float)(gamma/100000.); 206 #endif 207 #ifdef PNG_FIXED_POINT_SUPPORTED 208 info_ptr->int_gamma = gamma; 209 #endif 210 info_ptr->valid |= PNG_INFO_gAMA; 211 if(gamma == 0) 212 png_warning(png_ptr, "Setting gamma=0"); 213 } 214 #endif 215 216 #if defined(PNG_hIST_SUPPORTED) 217 void PNGAPI 218 png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist) 219 { 220 int i; 221 222 png_debug1(1, "in %s storage function\n", "hIST"); 223 if (png_ptr == NULL || info_ptr == NULL) 224 return; 225 if (info_ptr->num_palette <= 0 || info_ptr->num_palette 226 > PNG_MAX_PALETTE_LENGTH) 227 { 228 png_warning(png_ptr, 229 "Invalid palette size, hIST allocation skipped."); 230 return; 231 } 232 233 #ifdef PNG_FREE_ME_SUPPORTED 234 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0); 235 #endif 236 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in version 237 1.2.1 */ 238 png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr, 239 (png_uint_32)(PNG_MAX_PALETTE_LENGTH * png_sizeof (png_uint_16))); 240 if (png_ptr->hist == NULL) 241 { 242 png_warning(png_ptr, "Insufficient memory for hIST chunk data."); 243 return; 244 } 245 246 for (i = 0; i < info_ptr->num_palette; i++) 247 png_ptr->hist[i] = hist[i]; 248 info_ptr->hist = png_ptr->hist; 249 info_ptr->valid |= PNG_INFO_hIST; 250 251 #ifdef PNG_FREE_ME_SUPPORTED 252 info_ptr->free_me |= PNG_FREE_HIST; 253 #else 254 png_ptr->flags |= PNG_FLAG_FREE_HIST; 255 #endif 256 } 257 #endif 258 259 void PNGAPI 260 png_set_IHDR(png_structp png_ptr, png_infop info_ptr, 261 png_uint_32 width, png_uint_32 height, int bit_depth, 262 int color_type, int interlace_type, int compression_type, 263 int filter_type) 264 { 265 png_debug1(1, "in %s storage function\n", "IHDR"); 266 if (png_ptr == NULL || info_ptr == NULL) 267 return; 268 269 /* check for width and height valid values */ 270 if (width == 0 || height == 0) 271 png_error(png_ptr, "Image width or height is zero in IHDR"); 272 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 273 if (width > png_ptr->user_width_max || height > png_ptr->user_height_max) 274 png_error(png_ptr, "image size exceeds user limits in IHDR"); 275 #else 276 if (width > PNG_USER_WIDTH_MAX || height > PNG_USER_HEIGHT_MAX) 277 png_error(png_ptr, "image size exceeds user limits in IHDR"); 278 #endif 279 if (width > PNG_UINT_31_MAX || height > PNG_UINT_31_MAX) 280 png_error(png_ptr, "Invalid image size in IHDR"); 281 if ( width > (PNG_UINT_32_MAX 282 >> 3) /* 8-byte RGBA pixels */ 283 - 64 /* bigrowbuf hack */ 284 - 1 /* filter byte */ 285 - 7*8 /* rounding of width to multiple of 8 pixels */ 286 - 8) /* extra max_pixel_depth pad */ 287 png_warning(png_ptr, "Width is too large for libpng to process pixels"); 288 289 /* check other values */ 290 if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 && 291 bit_depth != 8 && bit_depth != 16) 292 png_error(png_ptr, "Invalid bit depth in IHDR"); 293 294 if (color_type < 0 || color_type == 1 || 295 color_type == 5 || color_type > 6) 296 png_error(png_ptr, "Invalid color type in IHDR"); 297 298 if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) || 299 ((color_type == PNG_COLOR_TYPE_RGB || 300 color_type == PNG_COLOR_TYPE_GRAY_ALPHA || 301 color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8)) 302 png_error(png_ptr, "Invalid color type/bit depth combination in IHDR"); 303 304 if (interlace_type >= PNG_INTERLACE_LAST) 305 png_error(png_ptr, "Unknown interlace method in IHDR"); 306 307 if (compression_type != PNG_COMPRESSION_TYPE_BASE) 308 png_error(png_ptr, "Unknown compression method in IHDR"); 309 310 #if defined(PNG_MNG_FEATURES_SUPPORTED) 311 /* Accept filter_method 64 (intrapixel differencing) only if 312 * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and 313 * 2. Libpng did not read a PNG signature (this filter_method is only 314 * used in PNG datastreams that are embedded in MNG datastreams) and 315 * 3. The application called png_permit_mng_features with a mask that 316 * included PNG_FLAG_MNG_FILTER_64 and 317 * 4. The filter_method is 64 and 318 * 5. The color_type is RGB or RGBA 319 */ 320 if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted) 321 png_warning(png_ptr,"MNG features are not allowed in a PNG datastream"); 322 if(filter_type != PNG_FILTER_TYPE_BASE) 323 { 324 if(!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && 325 (filter_type == PNG_INTRAPIXEL_DIFFERENCING) && 326 ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) && 327 (color_type == PNG_COLOR_TYPE_RGB || 328 color_type == PNG_COLOR_TYPE_RGB_ALPHA))) 329 png_error(png_ptr, "Unknown filter method in IHDR"); 330 if(png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) 331 png_warning(png_ptr, "Invalid filter method in IHDR"); 332 } 333 #else 334 if(filter_type != PNG_FILTER_TYPE_BASE) 335 png_error(png_ptr, "Unknown filter method in IHDR"); 336 #endif 337 338 info_ptr->width = width; 339 info_ptr->height = height; 340 info_ptr->bit_depth = (png_byte)bit_depth; 341 info_ptr->color_type =(png_byte) color_type; 342 info_ptr->compression_type = (png_byte)compression_type; 343 info_ptr->filter_type = (png_byte)filter_type; 344 info_ptr->interlace_type = (png_byte)interlace_type; 345 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 346 info_ptr->channels = 1; 347 else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR) 348 info_ptr->channels = 3; 349 else 350 info_ptr->channels = 1; 351 if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA) 352 info_ptr->channels++; 353 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth); 354 355 /* check for potential overflow */ 356 if (width > (PNG_UINT_32_MAX 357 >> 3) /* 8-byte RGBA pixels */ 358 - 64 /* bigrowbuf hack */ 359 - 1 /* filter byte */ 360 - 7*8 /* rounding of width to multiple of 8 pixels */ 361 - 8) /* extra max_pixel_depth pad */ 362 info_ptr->rowbytes = (png_size_t)0; 363 else 364 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth,width); 365 } 366 367 #if defined(PNG_oFFs_SUPPORTED) 368 void PNGAPI 369 png_set_oFFs(png_structp png_ptr, png_infop info_ptr, 370 png_int_32 offset_x, png_int_32 offset_y, int unit_type) 371 { 372 png_debug1(1, "in %s storage function\n", "oFFs"); 373 if (png_ptr == NULL || info_ptr == NULL) 374 return; 375 376 info_ptr->x_offset = offset_x; 377 info_ptr->y_offset = offset_y; 378 info_ptr->offset_unit_type = (png_byte)unit_type; 379 info_ptr->valid |= PNG_INFO_oFFs; 380 } 381 #endif 382 383 #if defined(PNG_pCAL_SUPPORTED) 384 void PNGAPI 385 png_set_pCAL(png_structp png_ptr, png_infop info_ptr, 386 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, 387 png_charp units, png_charpp params) 388 { 389 png_uint_32 length; 390 int i; 391 392 png_debug1(1, "in %s storage function\n", "pCAL"); 393 if (png_ptr == NULL || info_ptr == NULL) 394 return; 395 396 length = png_strlen(purpose) + 1; 397 png_debug1(3, "allocating purpose for info (%lu bytes)\n", length); 398 info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length); 399 if (info_ptr->pcal_purpose == NULL) 400 { 401 png_warning(png_ptr, "Insufficient memory for pCAL purpose."); 402 return; 403 } 404 png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length); 405 406 png_debug(3, "storing X0, X1, type, and nparams in info\n"); 407 info_ptr->pcal_X0 = X0; 408 info_ptr->pcal_X1 = X1; 409 info_ptr->pcal_type = (png_byte)type; 410 info_ptr->pcal_nparams = (png_byte)nparams; 411 412 length = png_strlen(units) + 1; 413 png_debug1(3, "allocating units for info (%lu bytes)\n", length); 414 info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length); 415 if (info_ptr->pcal_units == NULL) 416 { 417 png_warning(png_ptr, "Insufficient memory for pCAL units."); 418 return; 419 } 420 png_memcpy(info_ptr->pcal_units, units, (png_size_t)length); 421 422 info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr, 423 (png_uint_32)((nparams + 1) * png_sizeof(png_charp))); 424 if (info_ptr->pcal_params == NULL) 425 { 426 png_warning(png_ptr, "Insufficient memory for pCAL params."); 427 return; 428 } 429 430 info_ptr->pcal_params[nparams] = NULL; 431 432 for (i = 0; i < nparams; i++) 433 { 434 length = png_strlen(params[i]) + 1; 435 png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i, length); 436 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length); 437 if (info_ptr->pcal_params[i] == NULL) 438 { 439 png_warning(png_ptr, "Insufficient memory for pCAL parameter."); 440 return; 441 } 442 png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length); 443 } 444 445 info_ptr->valid |= PNG_INFO_pCAL; 446 #ifdef PNG_FREE_ME_SUPPORTED 447 info_ptr->free_me |= PNG_FREE_PCAL; 448 #endif 449 } 450 #endif 451 452 #if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED) 453 #ifdef PNG_FLOATING_POINT_SUPPORTED 454 void PNGAPI 455 png_set_sCAL(png_structp png_ptr, png_infop info_ptr, 456 int unit, double width, double height) 457 { 458 png_debug1(1, "in %s storage function\n", "sCAL"); 459 if (png_ptr == NULL || info_ptr == NULL) 460 return; 461 462 info_ptr->scal_unit = (png_byte)unit; 463 info_ptr->scal_pixel_width = width; 464 info_ptr->scal_pixel_height = height; 465 466 info_ptr->valid |= PNG_INFO_sCAL; 467 } 468 #else 469 #ifdef PNG_FIXED_POINT_SUPPORTED 470 void PNGAPI 471 png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr, 472 int unit, png_charp swidth, png_charp sheight) 473 { 474 png_uint_32 length; 475 476 png_debug1(1, "in %s storage function\n", "sCAL"); 477 if (png_ptr == NULL || info_ptr == NULL) 478 return; 479 480 info_ptr->scal_unit = (png_byte)unit; 481 482 length = png_strlen(swidth) + 1; 483 png_debug1(3, "allocating unit for info (%d bytes)\n", length); 484 info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, length); 485 if (info_ptr->scal_s_width == NULL) 486 { 487 png_warning(png_ptr, 488 "Memory allocation failed while processing sCAL."); 489 } 490 png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length); 491 492 length = png_strlen(sheight) + 1; 493 png_debug1(3, "allocating unit for info (%d bytes)\n", length); 494 info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, length); 495 if (info_ptr->scal_s_height == NULL) 496 { 497 png_free (png_ptr, info_ptr->scal_s_width); 498 png_warning(png_ptr, 499 "Memory allocation failed while processing sCAL."); 500 } 501 png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length); 502 503 info_ptr->valid |= PNG_INFO_sCAL; 504 #ifdef PNG_FREE_ME_SUPPORTED 505 info_ptr->free_me |= PNG_FREE_SCAL; 506 #endif 507 } 508 #endif 509 #endif 510 #endif 511 512 #if defined(PNG_pHYs_SUPPORTED) 513 void PNGAPI 514 png_set_pHYs(png_structp png_ptr, png_infop info_ptr, 515 png_uint_32 res_x, png_uint_32 res_y, int unit_type) 516 { 517 png_debug1(1, "in %s storage function\n", "pHYs"); 518 if (png_ptr == NULL || info_ptr == NULL) 519 return; 520 521 info_ptr->x_pixels_per_unit = res_x; 522 info_ptr->y_pixels_per_unit = res_y; 523 info_ptr->phys_unit_type = (png_byte)unit_type; 524 info_ptr->valid |= PNG_INFO_pHYs; 525 } 526 #endif 527 528 void PNGAPI 529 png_set_PLTE(png_structp png_ptr, png_infop info_ptr, 530 png_colorp palette, int num_palette) 531 { 532 533 png_debug1(1, "in %s storage function\n", "PLTE"); 534 if (png_ptr == NULL || info_ptr == NULL) 535 return; 536 537 if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH) 538 { 539 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 540 png_error(png_ptr, "Invalid palette length"); 541 else 542 { 543 png_warning(png_ptr, "Invalid palette length"); 544 return; 545 } 546 } 547 548 /* 549 * It may not actually be necessary to set png_ptr->palette here; 550 * we do it for backward compatibility with the way the png_handle_tRNS 551 * function used to do the allocation. 552 */ 553 #ifdef PNG_FREE_ME_SUPPORTED 554 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0); 555 #endif 556 557 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead 558 of num_palette entries, 559 in case of an invalid PNG file that has too-large sample values. */ 560 png_ptr->palette = (png_colorp)png_malloc(png_ptr, 561 PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color)); 562 png_memset(png_ptr->palette, 0, PNG_MAX_PALETTE_LENGTH * 563 png_sizeof(png_color)); 564 png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof (png_color)); 565 info_ptr->palette = png_ptr->palette; 566 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette; 567 568 #ifdef PNG_FREE_ME_SUPPORTED 569 info_ptr->free_me |= PNG_FREE_PLTE; 570 #else 571 png_ptr->flags |= PNG_FLAG_FREE_PLTE; 572 #endif 573 574 info_ptr->valid |= PNG_INFO_PLTE; 575 } 576 577 #if defined(PNG_sBIT_SUPPORTED) 578 void PNGAPI 579 png_set_sBIT(png_structp png_ptr, png_infop info_ptr, 580 png_color_8p sig_bit) 581 { 582 png_debug1(1, "in %s storage function\n", "sBIT"); 583 if (png_ptr == NULL || info_ptr == NULL) 584 return; 585 586 png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof (png_color_8)); 587 info_ptr->valid |= PNG_INFO_sBIT; 588 } 589 #endif 590 591 #if defined(PNG_sRGB_SUPPORTED) 592 void PNGAPI 593 png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent) 594 { 595 png_debug1(1, "in %s storage function\n", "sRGB"); 596 if (png_ptr == NULL || info_ptr == NULL) 597 return; 598 599 info_ptr->srgb_intent = (png_byte)intent; 600 info_ptr->valid |= PNG_INFO_sRGB; 601 } 602 603 void PNGAPI 604 png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr, 605 int intent) 606 { 607 #if defined(PNG_gAMA_SUPPORTED) 608 #ifdef PNG_FLOATING_POINT_SUPPORTED 609 float file_gamma; 610 #endif 611 #ifdef PNG_FIXED_POINT_SUPPORTED 612 png_fixed_point int_file_gamma; 613 #endif 614 #endif 615 #if defined(PNG_cHRM_SUPPORTED) 616 #ifdef PNG_FLOATING_POINT_SUPPORTED 617 float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y; 618 #endif 619 #ifdef PNG_FIXED_POINT_SUPPORTED 620 png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, 621 int_green_y, int_blue_x, int_blue_y; 622 #endif 623 #endif 624 png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM"); 625 if (png_ptr == NULL || info_ptr == NULL) 626 return; 627 628 png_set_sRGB(png_ptr, info_ptr, intent); 629 630 #if defined(PNG_gAMA_SUPPORTED) 631 #ifdef PNG_FLOATING_POINT_SUPPORTED 632 file_gamma = (float).45455; 633 png_set_gAMA(png_ptr, info_ptr, file_gamma); 634 #endif 635 #ifdef PNG_FIXED_POINT_SUPPORTED 636 int_file_gamma = 45455L; 637 png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma); 638 #endif 639 #endif 640 641 #if defined(PNG_cHRM_SUPPORTED) 642 #ifdef PNG_FIXED_POINT_SUPPORTED 643 int_white_x = 31270L; 644 int_white_y = 32900L; 645 int_red_x = 64000L; 646 int_red_y = 33000L; 647 int_green_x = 30000L; 648 int_green_y = 60000L; 649 int_blue_x = 15000L; 650 int_blue_y = 6000L; 651 652 png_set_cHRM_fixed(png_ptr, info_ptr, 653 int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, int_green_y, 654 int_blue_x, int_blue_y); 655 #endif 656 #ifdef PNG_FLOATING_POINT_SUPPORTED 657 white_x = (float).3127; 658 white_y = (float).3290; 659 red_x = (float).64; 660 red_y = (float).33; 661 green_x = (float).30; 662 green_y = (float).60; 663 blue_x = (float).15; 664 blue_y = (float).06; 665 666 png_set_cHRM(png_ptr, info_ptr, 667 white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y); 668 #endif 669 #endif 670 } 671 #endif 672 673 674 #if defined(PNG_iCCP_SUPPORTED) 675 void PNGAPI 676 png_set_iCCP(png_structp png_ptr, png_infop info_ptr, 677 png_charp name, int compression_type, 678 png_charp profile, png_uint_32 proflen) 679 { 680 png_charp new_iccp_name; 681 png_charp new_iccp_profile; 682 683 png_debug1(1, "in %s storage function\n", "iCCP"); 684 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL) 685 return; 686 687 new_iccp_name = (png_charp)png_malloc_warn(png_ptr, png_strlen(name)+1); 688 if (new_iccp_name == NULL) 689 { 690 png_warning(png_ptr, "Insufficient memory to process iCCP chunk."); 691 return; 692 } 693 png_strncpy(new_iccp_name, name, png_sizeof(new_iccp_name)); 694 new_iccp_profile = (png_charp)png_malloc_warn(png_ptr, proflen); 695 if (new_iccp_profile == NULL) 696 { 697 png_free (png_ptr, new_iccp_name); 698 png_warning(png_ptr, "Insufficient memory to process iCCP profile."); 699 return; 700 } 701 png_memcpy(new_iccp_profile, profile, (png_size_t)proflen); 702 703 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0); 704 705 info_ptr->iccp_proflen = proflen; 706 info_ptr->iccp_name = new_iccp_name; 707 info_ptr->iccp_profile = new_iccp_profile; 708 /* Compression is always zero but is here so the API and info structure 709 * does not have to change if we introduce multiple compression types */ 710 info_ptr->iccp_compression = (png_byte)compression_type; 711 #ifdef PNG_FREE_ME_SUPPORTED 712 info_ptr->free_me |= PNG_FREE_ICCP; 713 #endif 714 info_ptr->valid |= PNG_INFO_iCCP; 715 } 716 #endif 717 718 #if defined(PNG_TEXT_SUPPORTED) 719 void PNGAPI 720 png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr, 721 int num_text) 722 { 723 int ret; 724 ret=png_set_text_2(png_ptr, info_ptr, text_ptr, num_text); 725 if (ret) 726 png_error(png_ptr, "Insufficient memory to store text"); 727 } 728 729 int /* PRIVATE */ 730 png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr, 731 int num_text) 732 { 733 int i; 734 735 png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ? 736 "text" : (png_const_charp)png_ptr->chunk_name)); 737 738 if (png_ptr == NULL || info_ptr == NULL || num_text == 0) 739 return(0); 740 741 /* Make sure we have enough space in the "text" array in info_struct 742 * to hold all of the incoming text_ptr objects. 743 */ 744 if (info_ptr->num_text + num_text > info_ptr->max_text) 745 { 746 if (info_ptr->text != NULL) 747 { 748 png_textp old_text; 749 int old_max; 750 751 old_max = info_ptr->max_text; 752 info_ptr->max_text = info_ptr->num_text + num_text + 8; 753 old_text = info_ptr->text; 754 info_ptr->text = (png_textp)png_malloc_warn(png_ptr, 755 (png_uint_32)(info_ptr->max_text * png_sizeof (png_text))); 756 if (info_ptr->text == NULL) 757 { 758 png_free(png_ptr, old_text); 759 return(1); 760 } 761 png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max * 762 png_sizeof(png_text))); 763 png_free(png_ptr, old_text); 764 } 765 else 766 { 767 info_ptr->max_text = num_text + 8; 768 info_ptr->num_text = 0; 769 info_ptr->text = (png_textp)png_malloc_warn(png_ptr, 770 (png_uint_32)(info_ptr->max_text * png_sizeof (png_text))); 771 if (info_ptr->text == NULL) 772 return(1); 773 #ifdef PNG_FREE_ME_SUPPORTED 774 info_ptr->free_me |= PNG_FREE_TEXT; 775 #endif 776 } 777 png_debug1(3, "allocated %d entries for info_ptr->text\n", 778 info_ptr->max_text); 779 } 780 for (i = 0; i < num_text; i++) 781 { 782 png_size_t text_length,key_len; 783 png_size_t lang_len,lang_key_len; 784 png_textp textp = &(info_ptr->text[info_ptr->num_text]); 785 786 if (text_ptr[i].key == NULL) 787 continue; 788 789 key_len = png_strlen(text_ptr[i].key); 790 791 if(text_ptr[i].compression <= 0) 792 { 793 lang_len = 0; 794 lang_key_len = 0; 795 } 796 else 797 #ifdef PNG_iTXt_SUPPORTED 798 { 799 /* set iTXt data */ 800 if (text_ptr[i].lang != NULL) 801 lang_len = png_strlen(text_ptr[i].lang); 802 else 803 lang_len = 0; 804 if (text_ptr[i].lang_key != NULL) 805 lang_key_len = png_strlen(text_ptr[i].lang_key); 806 else 807 lang_key_len = 0; 808 } 809 #else 810 { 811 png_warning(png_ptr, "iTXt chunk not supported."); 812 continue; 813 } 814 #endif 815 816 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0') 817 { 818 text_length = 0; 819 #ifdef PNG_iTXt_SUPPORTED 820 if(text_ptr[i].compression > 0) 821 textp->compression = PNG_ITXT_COMPRESSION_NONE; 822 else 823 #endif 824 textp->compression = PNG_TEXT_COMPRESSION_NONE; 825 } 826 else 827 { 828 text_length = png_strlen(text_ptr[i].text); 829 textp->compression = text_ptr[i].compression; 830 } 831 832 textp->key = (png_charp)png_malloc_warn(png_ptr, 833 (png_uint_32)(key_len + text_length + lang_len + lang_key_len + 4)); 834 if (textp->key == NULL) 835 return(1); 836 png_debug2(2, "Allocated %lu bytes at %x in png_set_text\n", 837 (png_uint_32)(key_len + lang_len + lang_key_len + text_length + 4), 838 (int)textp->key); 839 840 png_memcpy(textp->key, text_ptr[i].key, 841 (png_size_t)(key_len)); 842 *(textp->key+key_len) = '\0'; 843 #ifdef PNG_iTXt_SUPPORTED 844 if (text_ptr[i].compression > 0) 845 { 846 textp->lang=textp->key + key_len + 1; 847 png_memcpy(textp->lang, text_ptr[i].lang, lang_len); 848 *(textp->lang+lang_len) = '\0'; 849 textp->lang_key=textp->lang + lang_len + 1; 850 png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len); 851 *(textp->lang_key+lang_key_len) = '\0'; 852 textp->text=textp->lang_key + lang_key_len + 1; 853 } 854 else 855 #endif 856 { 857 #ifdef PNG_iTXt_SUPPORTED 858 textp->lang=NULL; 859 textp->lang_key=NULL; 860 #endif 861 textp->text=textp->key + key_len + 1; 862 } 863 if(text_length) 864 png_memcpy(textp->text, text_ptr[i].text, 865 (png_size_t)(text_length)); 866 *(textp->text+text_length) = '\0'; 867 868 #ifdef PNG_iTXt_SUPPORTED 869 if(textp->compression > 0) 870 { 871 textp->text_length = 0; 872 textp->itxt_length = text_length; 873 } 874 else 875 #endif 876 { 877 textp->text_length = text_length; 878 #ifdef PNG_iTXt_SUPPORTED 879 textp->itxt_length = 0; 880 #endif 881 } 882 info_ptr->num_text++; 883 png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text); 884 } 885 return(0); 886 } 887 #endif 888 889 #if defined(PNG_tIME_SUPPORTED) 890 void PNGAPI 891 png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time) 892 { 893 png_debug1(1, "in %s storage function\n", "tIME"); 894 if (png_ptr == NULL || info_ptr == NULL || 895 (png_ptr->mode & PNG_WROTE_tIME)) 896 return; 897 898 png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof (png_time)); 899 info_ptr->valid |= PNG_INFO_tIME; 900 } 901 #endif 902 903 #if defined(PNG_tRNS_SUPPORTED) 904 void PNGAPI 905 png_set_tRNS(png_structp png_ptr, png_infop info_ptr, 906 png_bytep trans, int num_trans, png_color_16p trans_values) 907 { 908 png_debug1(1, "in %s storage function\n", "tRNS"); 909 if (png_ptr == NULL || info_ptr == NULL) 910 return; 911 912 if (trans != NULL) 913 { 914 /* 915 * It may not actually be necessary to set png_ptr->trans here; 916 * we do it for backward compatibility with the way the png_handle_tRNS 917 * function used to do the allocation. 918 */ 919 #ifdef PNG_FREE_ME_SUPPORTED 920 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0); 921 #endif 922 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */ 923 png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr, 924 (png_uint_32)PNG_MAX_PALETTE_LENGTH); 925 if (num_trans <= PNG_MAX_PALETTE_LENGTH) 926 png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans); 927 #ifdef PNG_FREE_ME_SUPPORTED 928 info_ptr->free_me |= PNG_FREE_TRNS; 929 #else 930 png_ptr->flags |= PNG_FLAG_FREE_TRNS; 931 #endif 932 } 933 934 if (trans_values != NULL) 935 { 936 png_memcpy(&(info_ptr->trans_values), trans_values, 937 png_sizeof(png_color_16)); 938 if (num_trans == 0) 939 num_trans = 1; 940 } 941 info_ptr->num_trans = (png_uint_16)num_trans; 942 info_ptr->valid |= PNG_INFO_tRNS; 943 } 944 #endif 945 946 #if defined(PNG_sPLT_SUPPORTED) 947 void PNGAPI 948 png_set_sPLT(png_structp png_ptr, 949 png_infop info_ptr, png_sPLT_tp entries, int nentries) 950 { 951 png_sPLT_tp np; 952 int i; 953 954 if (png_ptr == NULL || info_ptr == NULL) 955 return; 956 957 np = (png_sPLT_tp)png_malloc_warn(png_ptr, 958 (info_ptr->splt_palettes_num + nentries) * png_sizeof(png_sPLT_t)); 959 if (np == NULL) 960 { 961 png_warning(png_ptr, "No memory for sPLT palettes."); 962 return; 963 } 964 965 png_memcpy(np, info_ptr->splt_palettes, 966 info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t)); 967 png_free(png_ptr, info_ptr->splt_palettes); 968 info_ptr->splt_palettes=NULL; 969 970 for (i = 0; i < nentries; i++) 971 { 972 png_sPLT_tp to = np + info_ptr->splt_palettes_num + i; 973 png_sPLT_tp from = entries + i; 974 975 to->name = (png_charp)png_malloc_warn(png_ptr, 976 png_strlen(from->name) + 1); 977 if (to->name == NULL) 978 { 979 png_warning(png_ptr, 980 "Out of memory while processing sPLT chunk"); 981 } 982 /* TODO: use png_malloc_warn */ 983 png_strncpy(to->name, from->name, png_strlen(from->name)); 984 to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr, 985 from->nentries * png_sizeof(png_sPLT_entry)); 986 /* TODO: use png_malloc_warn */ 987 png_memcpy(to->entries, from->entries, 988 from->nentries * png_sizeof(png_sPLT_entry)); 989 if (to->entries == NULL) 990 { 991 png_warning(png_ptr, 992 "Out of memory while processing sPLT chunk"); 993 png_free(png_ptr,to->name); 994 to->name = NULL; 995 } 996 to->nentries = from->nentries; 997 to->depth = from->depth; 998 } 999 1000 info_ptr->splt_palettes = np; 1001 info_ptr->splt_palettes_num += nentries; 1002 info_ptr->valid |= PNG_INFO_sPLT; 1003 #ifdef PNG_FREE_ME_SUPPORTED 1004 info_ptr->free_me |= PNG_FREE_SPLT; 1005 #endif 1006 } 1007 #endif /* PNG_sPLT_SUPPORTED */ 1008 1009 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1010 void PNGAPI 1011 png_set_unknown_chunks(png_structp png_ptr, 1012 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns) 1013 { 1014 png_unknown_chunkp np; 1015 int i; 1016 1017 if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0) 1018 return; 1019 1020 np = (png_unknown_chunkp)png_malloc_warn(png_ptr, 1021 (info_ptr->unknown_chunks_num + num_unknowns) * 1022 png_sizeof(png_unknown_chunk)); 1023 if (np == NULL) 1024 { 1025 png_warning(png_ptr, 1026 "Out of memory while processing unknown chunk."); 1027 return; 1028 } 1029 1030 png_memcpy(np, info_ptr->unknown_chunks, 1031 info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk)); 1032 png_free(png_ptr, info_ptr->unknown_chunks); 1033 info_ptr->unknown_chunks=NULL; 1034 1035 for (i = 0; i < num_unknowns; i++) 1036 { 1037 png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i; 1038 png_unknown_chunkp from = unknowns + i; 1039 1040 png_strncpy((png_charp)to->name, (png_charp)from->name, 5); 1041 to->data = (png_bytep)png_malloc_warn(png_ptr, from->size); 1042 if (to->data == NULL) 1043 { 1044 png_warning(png_ptr, 1045 "Out of memory while processing unknown chunk."); 1046 } 1047 else 1048 { 1049 png_memcpy(to->data, from->data, from->size); 1050 to->size = from->size; 1051 1052 /* note our location in the read or write sequence */ 1053 to->location = (png_byte)(png_ptr->mode & 0xff); 1054 } 1055 } 1056 1057 info_ptr->unknown_chunks = np; 1058 info_ptr->unknown_chunks_num += num_unknowns; 1059 #ifdef PNG_FREE_ME_SUPPORTED 1060 info_ptr->free_me |= PNG_FREE_UNKN; 1061 #endif 1062 } 1063 void PNGAPI 1064 png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr, 1065 int chunk, int location) 1066 { 1067 if(png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk < 1068 (int)info_ptr->unknown_chunks_num) 1069 info_ptr->unknown_chunks[chunk].location = (png_byte)location; 1070 } 1071 #endif 1072 1073 #if defined(PNG_1_0_X) || defined(PNG_1_2_X) 1074 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1075 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1076 void PNGAPI 1077 png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted) 1078 { 1079 /* This function is deprecated in favor of png_permit_mng_features() 1080 and will be removed from libpng-1.3.0 */ 1081 png_debug(1, "in png_permit_empty_plte, DEPRECATED.\n"); 1082 if (png_ptr == NULL) 1083 return; 1084 png_ptr->mng_features_permitted = (png_byte) 1085 ((png_ptr->mng_features_permitted & (~(PNG_FLAG_MNG_EMPTY_PLTE))) | 1086 ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE))); 1087 } 1088 #endif 1089 #endif 1090 1091 #if defined(PNG_MNG_FEATURES_SUPPORTED) 1092 png_uint_32 PNGAPI 1093 png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features) 1094 { 1095 png_debug(1, "in png_permit_mng_features\n"); 1096 if (png_ptr == NULL) 1097 return (png_uint_32)0; 1098 png_ptr->mng_features_permitted = 1099 (png_byte)(mng_features & PNG_ALL_MNG_FEATURES); 1100 return (png_uint_32)png_ptr->mng_features_permitted; 1101 } 1102 #endif 1103 1104 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1105 void PNGAPI 1106 png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep 1107 chunk_list, int num_chunks) 1108 { 1109 png_bytep new_list, p; 1110 int i, old_num_chunks; 1111 if (png_ptr == NULL) 1112 return; 1113 if (num_chunks == 0) 1114 { 1115 if(keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE) 1116 png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS; 1117 else 1118 png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS; 1119 1120 if(keep == PNG_HANDLE_CHUNK_ALWAYS) 1121 png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS; 1122 else 1123 png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS; 1124 return; 1125 } 1126 if (chunk_list == NULL) 1127 return; 1128 old_num_chunks=png_ptr->num_chunk_list; 1129 new_list=(png_bytep)png_malloc(png_ptr, 1130 (png_uint_32)(5*(num_chunks+old_num_chunks))); 1131 if(png_ptr->chunk_list != NULL) 1132 { 1133 png_memcpy(new_list, png_ptr->chunk_list, 1134 (png_size_t)(5*old_num_chunks)); 1135 png_free(png_ptr, png_ptr->chunk_list); 1136 png_ptr->chunk_list=NULL; 1137 } 1138 png_memcpy(new_list+5*old_num_chunks, chunk_list, 1139 (png_size_t)(5*num_chunks)); 1140 for (p=new_list+5*old_num_chunks+4, i=0; i<num_chunks; i++, p+=5) 1141 *p=(png_byte)keep; 1142 png_ptr->num_chunk_list=old_num_chunks+num_chunks; 1143 png_ptr->chunk_list=new_list; 1144 #ifdef PNG_FREE_ME_SUPPORTED 1145 png_ptr->free_me |= PNG_FREE_LIST; 1146 #endif 1147 } 1148 #endif 1149 1150 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED) 1151 void PNGAPI 1152 png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr, 1153 png_user_chunk_ptr read_user_chunk_fn) 1154 { 1155 png_debug(1, "in png_set_read_user_chunk_fn\n"); 1156 if (png_ptr == NULL) 1157 return; 1158 png_ptr->read_user_chunk_fn = read_user_chunk_fn; 1159 png_ptr->user_chunk_ptr = user_chunk_ptr; 1160 } 1161 #endif 1162 1163 #if defined(PNG_INFO_IMAGE_SUPPORTED) 1164 void PNGAPI 1165 png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers) 1166 { 1167 png_debug1(1, "in %s storage function\n", "rows"); 1168 1169 if (png_ptr == NULL || info_ptr == NULL) 1170 return; 1171 1172 if(info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers)) 1173 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); 1174 info_ptr->row_pointers = row_pointers; 1175 if(row_pointers) 1176 info_ptr->valid |= PNG_INFO_IDAT; 1177 } 1178 #endif 1179 1180 #ifdef PNG_WRITE_SUPPORTED 1181 void PNGAPI 1182 png_set_compression_buffer_size(png_structp png_ptr, png_uint_32 size) 1183 { 1184 if (png_ptr == NULL) 1185 return; 1186 if(png_ptr->zbuf) 1187 png_free(png_ptr, png_ptr->zbuf); 1188 png_ptr->zbuf_size = (png_size_t)size; 1189 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size); 1190 png_ptr->zstream.next_out = png_ptr->zbuf; 1191 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; 1192 } 1193 #endif 1194 1195 void PNGAPI 1196 png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask) 1197 { 1198 if (png_ptr && info_ptr) 1199 info_ptr->valid &= ~(mask); 1200 } 1201 1202 1203 #ifndef PNG_1_0_X 1204 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED 1205 /* this function was added to libpng 1.2.0 and should always exist by default */ 1206 void PNGAPI 1207 png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags) 1208 { 1209 #ifdef PNG_MMX_CODE_SUPPORTED 1210 png_uint_32 settable_asm_flags; 1211 png_uint_32 settable_mmx_flags; 1212 #endif 1213 if (png_ptr == NULL) 1214 return; 1215 #ifdef PNG_MMX_CODE_SUPPORTED 1216 1217 settable_mmx_flags = 1218 #ifdef PNG_HAVE_MMX_COMBINE_ROW 1219 PNG_ASM_FLAG_MMX_READ_COMBINE_ROW | 1220 #endif 1221 #ifdef PNG_HAVE_MMX_READ_INTERLACE 1222 PNG_ASM_FLAG_MMX_READ_INTERLACE | 1223 #endif 1224 #ifdef PNG_HAVE_MMX_READ_FILTER_ROW 1225 PNG_ASM_FLAG_MMX_READ_FILTER_SUB | 1226 PNG_ASM_FLAG_MMX_READ_FILTER_UP | 1227 PNG_ASM_FLAG_MMX_READ_FILTER_AVG | 1228 PNG_ASM_FLAG_MMX_READ_FILTER_PAETH | 1229 #endif 1230 0; 1231 1232 /* could be some non-MMX ones in the future, but not currently: */ 1233 settable_asm_flags = settable_mmx_flags; 1234 1235 if (!(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_COMPILED) || 1236 !(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU)) 1237 { 1238 /* clear all MMX flags if MMX isn't supported */ 1239 settable_asm_flags &= ~settable_mmx_flags; 1240 png_ptr->asm_flags &= ~settable_mmx_flags; 1241 } 1242 1243 /* we're replacing the settable bits with those passed in by the user, 1244 * so first zero them out of the master copy, then bitwise-OR in the 1245 * allowed subset that was requested */ 1246 1247 png_ptr->asm_flags &= ~settable_asm_flags; /* zero them */ 1248 png_ptr->asm_flags |= (asm_flags & settable_asm_flags); /* set them */ 1249 #endif /* ?PNG_MMX_CODE_SUPPORTED */ 1250 } 1251 1252 /* this function was added to libpng 1.2.0 */ 1253 void PNGAPI 1254 png_set_mmx_thresholds (png_structp png_ptr, 1255 png_byte mmx_bitdepth_threshold, 1256 png_uint_32 mmx_rowbytes_threshold) 1257 { 1258 if (png_ptr == NULL) 1259 return; 1260 #ifdef PNG_MMX_CODE_SUPPORTED 1261 png_ptr->mmx_bitdepth_threshold = mmx_bitdepth_threshold; 1262 png_ptr->mmx_rowbytes_threshold = mmx_rowbytes_threshold; 1263 #endif /* ?PNG_MMX_CODE_SUPPORTED */ 1264 } 1265 #endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */ 1266 1267 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 1268 /* this function was added to libpng 1.2.6 */ 1269 void PNGAPI 1270 png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max, 1271 png_uint_32 user_height_max) 1272 { 1273 /* Images with dimensions larger than these limits will be 1274 * rejected by png_set_IHDR(). To accept any PNG datastream 1275 * regardless of dimensions, set both limits to 0x7ffffffL. 1276 */ 1277 if(png_ptr == NULL) return; 1278 png_ptr->user_width_max = user_width_max; 1279 png_ptr->user_height_max = user_height_max; 1280 } 1281 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */ 1282 1283 #endif /* ?PNG_1_0_X */ 1284 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ 1285
